1. INTRODUCTION :
In today’s world remote control over the electronic appliances is of the utmost importance. The
conventional techniques are either wired or work on a line of sight communication and hence put
a limit on the range over they can be operated.
In today’s era communication system is bringing the world closer and telecommunication is one
of the inevitable parts and serves the best medium to control the appliances.The objective is to
control the appliancesdevices from any corner of the world which can be effectively achieved
through telephonic control since the telephonic network covers the entire globe.
This project employs the same technique for controlling various devices through the telephone
line.The basic heart of this project is the DTMF tone. All the data required to control the
appliances is based on the detection of the DTMF tone.
DTMF:
Dual tone multi-frequency (DTMF) is a scheme for encoding 16 characters using the sums of
sinusoidal signals of two distinct, harmonically unrelated frequencies. The 16 characters are each
represented by one frequency from a low frequency group (ranging from 697 Hz to 941 Hz) and
one from a high frequency group (ranging from 1209 Hz to 1633 Hz).
PROJECT AIM AND OBJECTIVE:
In the advancing world of 21st century there need to be controlling devices in almost all
the places viz. home [controlling of various appliances], office [electronic authentication for
access to a specific cabin, restricted area etc.], factory [control and instrumentation], public
places [ traffic signal control automatic railway crossing signal control etc.] etc. All these
controls should be achieved via easily available public level interface like power line, telephone
line or through internet. And the medium through which the objective is to be achieved depends
on the device to be controlled and the placement of the device. For our project we have decided
to use mobile as a medium for controlling devices since we are basically devising a system that
will be user friendly, would be used to control the appliances from any corner of the world and
will still maintain privacy and restrict access to the unauthorized user.
Features
• Low Power Consumption
• Adjustable Acquisition and Release Times
• Central Office Quality and Performance
• Inexpensive 3.58 MHz Time Base
• Single 5 Volt Power Supply
• Dial Tone Suppression
2. Block Diagram
APPLICATIONS:
1. INDUSTRIAL CONTROL:
It is used to control or switch on any automatic process control machinery.
Electric grid could be controlled remotely.Automatic production machinery could be controlled
even during odd hours with your mobile phone.
2. HOME AUTOMATION:
To monitor status of home appliances. To control(ON/OFF) the home appliances according to
there status when we are going away from home.
3. FARM AUTOMATION:
To control & monitor the various irrigation equipments in the farm.
![INTRODUCTION :
In today’s world remote control over the electronic appliances is of the utmost importance. The
conventional techniques are either wired or work on a line of sight communication and hence put
a limit on the range over they can be operated.
In today’s era communication system is bringing the world closer and telecommunication is one
of the inevitable parts and serves the best medium to control the appliances.The objective is to
control the appliancesdevices from any corner of the world which can be effectively achieved
through telephonic control since the telephonic network covers the entire globe.
This project employs the same technique for controlling various devices through the telephone
line.The basic heart of this project is the DTMF tone. All the data required to control the
appliances is based on the detection of the DTMF tone.
DTMF:
Dual tone multi-frequency (DTMF) is a scheme for encoding 16 characters using the sums of
sinusoidal signals of two distinct, harmonically unrelated frequencies. The 16 characters are each
represented by one frequency from a low frequency group (ranging from 697 Hz to 941 Hz) and
one from a high frequency group (ranging from 1209 Hz to 1633 Hz).
PROJECT AIM AND OBJECTIVE:
In the advancing world of 21st century there need to be controlling devices in almost all
the places viz. home [controlling of various appliances], office [electronic authentication for
access to a specific cabin, restricted area etc.], factory [control and instrumentation], public
places [ traffic signal control automatic railway crossing signal control etc.] etc. All these
controls should be achieved via easily available public level interface like power line, telephone
line or through internet. And the medium through which the objective is to be achieved depends
on the device to be controlled and the placement of the device. For our project we have decided
to use mobile as a medium for controlling devices since we are basically devising a system that
will be user friendly, would be used to control the appliances from any corner of the world and
will still maintain privacy and restrict access to the unauthorized user.
Features
• Low Power Consumption
• Adjustable Acquisition and Release Times
• Central Office Quality and Performance
• Inexpensive 3.58 MHz Time Base
• Single 5 Volt Power Supply
• Dial Tone Suppression](https://image.slidesharecdn.com/picmicrocontroller-130222014717-phpapp02/85/pic-microcontroller-1-320.jpg)
